I can't recall what a 30 caliber blank looks like, but regarding 5.56 brass, that deep crimp in the necks would leave me with no possible desire to reload it, anyway. that stuff is folded tightly, then ripped open violently, and that may or may not stress the brass to the point of splitting. Not that split necks are terribly hazardous, I guess, but it's a problem in my opinion.